Information disclosure in Oracle XML Database
CVE-2026-21999
Vulnerability in the XML Database component of Oracle Database Server. Supported versions that are affected are 23.4.0-23.26.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTPS to compromise XML Database. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all XML Database accessible data. CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N).
Vulnerability class: Information Disclosure
EPSS: 0.002 (15.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N.
Affected products
- Oracle Xml_database
- Oracle Corporation Database Server — versions 23.4.0
Weakness classification (CWE)
References
- secalert_us@oracle.com (vendor-advisory, Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-21999?
- CVE-2026-21999 is a medium-severity vulnerability in Oracle XML Database, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-04-21.
- How severe is CVE-2026-21999?
- Medium severity. CVSS v3 base score is 5.3 out of 10.